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 ###Instrução: Qual piloto teve um grid de 18 com 68 voltas?
 ###Tabelas: CREATE TABLE current_members (current_members_id AUTO_INCREMENT PRIMARY KEY, Institution VARCHAR, Nickname VARCHAR, Location VARCHAR, Founded INT, Type VARCHAR, Enrollment INT, Joined INT) CREATE TABLE race (race_id AUTO_INCREMENT PRIMARY KEY, Driver VARCHAR, Constructor VARCHAR, Laps VARCHAR, Time/Retired VARCHAR, Grid VARCHAR) CREATE TABLE women's_jianshu__&__qiangshu_combined (women's_jianshu__&__qiangshu_combined_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Athlete VARCHAR, Qiangshu INT, Jianshu INT, Total INT) CREATE TABLE global_challenge_2004_5 (global_challenge_2004_5_id AUTO_INCREMENT PRIMARY KEY, Overall place VARCHAR, Yacht name VARCHAR, Skipper VARCHAR, Points VARCHAR, Combined elapsed time VARCHAR) CREATE TABLE births_and_deaths (births_and_deaths_id AUTO_INCREMENT PRIMARY KEY, Average population (x 1000) VARCHAR, Live births 1 VARCHAR, Deaths 1 VARCHAR, Natural change 1 VARCHAR, Crude birth rate (per 1000) INT, Crude death rate (per 1000) INT, Natural change (per 1000) INT)  
SELECT Driver FROM race WHERE Laps = 68 AND Grid = 18